Used primarily in peptide synthesis, Fmoc-Cpg-OH is an N-Fmoc protected amino acid derivative where the Fmoc group serves as a protecting group for the amino group, ensuring selective reactions during the formation of peptide bonds. It is particularly valuable in solid-phase peptide synthesis (SPPS), where it helps in the stepwise assembly of peptides. The Fmoc group can be easily removed under mild basic conditions, making it a preferred choice for synthesizing complex peptides and proteins. It is also employed in the preparation of peptide-based drugs, biomaterials, and research tools, contributing to advancements in medicinal chemistry and biochemistry.